Display device and manufacturing method of display device
View Patent ↗A display device includes a first substrate, a wavelength conversion layer disposed on the first substrate, an inorganic film disposed on the wavelength conversion layer, a flattening film disposed on the inorganic film, and a first polarizing layer disposed on the flattening film, where a difference between a coefficient of thermal expansion of the flattening film and a coefficient of thermal expansion of the inorganic film is about 50 ppm/K or less.
1. A display device comprising:
a first substrate;
a wavelength conversion layer disposed on the first substrate;
an inorganic film disposed on the wavelength conversion layer;
a flattening film disposed on the inorganic film; and
a first polarizing layer disposed on the flattening film,
wherein a difference between a coefficient of thermal expansion of the flattening film and a coefficient of thermal expansion of the inorganic film is about 50 ppm/K or less.
2. The display device of claim 1 , wherein the wavelength conversion layer comprises quantum dots.
3. The display device of claim 1 , wherein a thickness of the wavelength conversion layer is in a range of about 5 μm to about 7 μm.
4. The display device of claim 3 , wherein a thickness of the flattening film is in a range of about 6 μm to about 10 μm.
5. The display device of claim 1 , wherein the flattening film comprises polyimide.
6. The display device of claim 5 , wherein the coefficient of thermal expansion of the flattening film is in a range of about 5 ppm/K to about 35 ppm/K.
7. The display device of claim 1 , wherein the difference between the coefficient of thermal expansion of the flattening film and the coefficient of thermal expansion of the inorganic film is in a range of about 1.7 ppm/K to about 32.9 ppm/K.
8. The display device of claim 7 , wherein the flattening film further comprises diamine.
9. The display device of claim 8 , wherein the diamine is in an amount of 20 to 80 parts by weight with respect to 100 parts by weight of the polyimide.
10. The display device of claim 1 , wherein the inorganic film reflects green light and red light, and transmits blue light.
11. The display device of claim 1 , wherein the first polarizing layer comprises a wire grid polarizer.
12. The display device of claim 1 , further comprising:
a backlight unit which emits blue light and provides the blue light to the wavelength conversion layer.
13. The display device of claim 12 , further comprising:
a light transmitting layer disposed to be adjacent to the wavelength conversion layer.
14. The display device of claim 1 , wherein
the wavelength conversion layer is provided in plural, and
the wavelength conversion layers have different heights from each other.
15. A method of manufacturing a display device, the method comprising:
preparing a first substrate on which a wavelength conversion layer is provided;
providing an inorganic film on the first substrate to cover the wavelength conversion layer;
providing a flattening film on the inorganic film; and
providing a first polarizing layer on the flattening film.
wherein a difference between a coefficient of thermal expansion of the flattening film and a coefficient of thermal expansion of the inorganic film is about 50 ppm/K or less.
16. The method of claim 15 , wherein the wavelength conversion layer comprises quantum dots.
17. The method of claim 16 , wherein a thickness of the wavelength conversion layer is in a range of about 5 μm to about 7 μm.
18. The method of claim 17 , wherein a thickness of the flattening film is in a range of about 6 μm to about 10 μm.
19. The method of claim 15 , wherein the flattening film comprises polyimide.
20. The method of claim 15 , wherein the difference between the coefficient of thermal expansion of the flattening film and the coefficient of thermal expansion of the inorganic film is in a range of about 1.7 ppm/K to about 32.9 ppm/K.